[Amc-list] Transmissions of Interest - Part II -

[Brien Tourville <hh7x@xxxxxxxxxxx>]

600nm = 442.5372727 ft.lbs Torque Capacity -



Since this is an Aussie write up - for a 6cyl. engine app. -
the torque figures may differ from the ZF 6hp26 unit behind
the 330cu.in. Lincoln Navigator engine.


 From other readings - there is a control module on / in the
trans. - readings are sent to it from PCM via link.


Setting up a paddle shift arrangement should be a
plug 'n play affair.


The 245T is a DOHC Turbo 6 while the Boss 260 is a
honkin' 5.4 version of the 'Navi' DOHC v8 powerplant.




Fullboost latest news - (http://www.fullboost.com.au/news.php?newsId=1183)

2007/05/09 07:49:36

----------------------------------

 

World class six-speed automatic



"Not only does it reward a sporty driving style with livelier 
performance and sharper responses, but it also delivers significant 
benefits in terms of reduced fuel consumption and greater refinement, 
with smoother shift quality a notable feature during everyday use."

 

ZF 6HP26 six-speed automatic


The six-speed automatic is a compact and lightweight, high efficiency, 
high torque capacity transmission with a low first gear, higher top gear 
and smaller, more graduated steps between each gear.

 

With a larger spread of ratios, the six-speed transmission offers 
real-world benefits in the traditionally divergent areas of performance 
and fuel consumption. A low first gear greatly improves launch feel, 
while the larger and tighter spread of ratios delivers livelier 
performance, especially at wide open throttle, along with the added 
benefits of smoother shift quality and reduced fuel consumption.

 

ZF 6HP26 six-speed automatic

1st gear ratio 4.17

2nd gear ratio 2.34

3rd gear ratio 1.52

4th gear ratio 1.14

5th gear ratio 0.87

6th gear ratio 0.69

Reverse 3.4

 

Final Drive

Barra 190: 2.73

Barra 230: 2.53

Barra 245T / Boss 260: 2.73

 

Gear shifts between the top few gears are often imperceptible, while the 
smaller steps between 3rd, 4th, 5th and 6th also ensure less busyness 
within the transmission as it determines the right gear.

 

The end result of the transmission being in the right gear at the right 
time is both an improvement in vehicle performance and a reduction in 
fuel consumption.

 

There are two versions of the six-speed automatic transmission  a 
standard version with a torque capacity of 450 Newton metres and a 
performance version with a torque capacity of 600Nm.

 

The performance version features upgraded clutches, with extra plates in 
the clutch packs, to increase the torque capacity for use with higher 
torque output engines. Falcon models using the Barra 190 engine are 
fitted with the standard version, while Falcon models using either the 
Barra 230, Barra 245T or Boss 260 powerplants will be fitted with the 
higher torque capacity performance version.

 

Software and calibration

The ZF transmission is able to tailor its responses to individual 
driving styles courtesy of a number of software functions and Driver 
Recognition features, all designed to deliver increased transmission 
functionality and performance, and a refined shift quality.

 

The Sequential Sports Shift feature introduced on BA Falcon is a key 
element of the six-speed automatic transmission, offering the same style 
of adaptive and performance automatic modes as well as total manual 
control through sequential manual shifting. Torque converter clutch 
lock-up is available in all six forward gears, not just in the top two 
overdrive gears.

 

When towing heavy loads at low speeds, such as in city driving or 
through hilly terrain, converter clutch lock-up in all gears assists 
with better transmission cooling and reduced fuel consumption.

 

Electronic control of all gearshifts in the six-speed automatic 
transmission is via clutches rather than bands, delivering a more direct 
and refined shift quality.

 

Calibration features of the six-speed automatic transmission include:

 

* Grade Control Logic (Automatic modes)

* When driving downhill, with sufficient brake pedal pressure, the 
transmission will downshift to provide increased engine braking.

* Upshift prevention at zero throttle (Automatic modes)

* When coasting downhill from rest, this feature inhibits upshifts 
beyond 2nd gear with zero throttle pedal input, to prevent a running 
away feeling.

* Emergency downshift (Manual mode)

* When in manual mode, if the throttle pedal is pushed through the 
detent to activate the kickdown switch, the transmission will downshift 
to a lower gear (depending on vehicle speed) to provide acceleration in 
an emergency situation. The transmission will then revert to full manual 
control, remaining in the kickdown gear and requiring the driver to 
input for upshift.

 

Driver Recognition

A host of advanced features are accessible to the driver as part of the 
Driver Recognition software with the six-speed automatic transmission.

 

Driver Recognition matches transmission performance to the current 
driving style by considering acceleration and deceleration rates, brake 
and throttle applications, and cornering speed, to ensure the vehicle is 
in the right gear at the right time without undesired gear shifts. The 
transmission learns the driver's style and assigns a theoretical point 
system to certain driving scenarios to determine the activation point of 
particular features.

 

The point system extends from a base fuel economy bias (0 points), 
through stages such as sporty driver (100 points), up to ehntusiast 
(200 points).

 

The transmission software recognises various performance-based actions, 
such as rapid acceleration / pullaways, enthusiastic cornering, pushing 
the accelerator pedal through the detent and moving the shift lever into 
performance mode, and increases the number of points accordingly.

 

By moving the shift lever across from adaptive to performance mode, the 
driver recognition function increases by 100 points instantly, making 
the advanced features more accessible. If the transmission had already 
learnt to 40 points in adaptive mode, then when the shift lever is 
pushed across into the performance mode it would become 140 points. In 
performance mode, driver recognition can learn from sporty, 
representing 100 points, up to enthusiast (200 points).

 

Points can be gathered quickly as increases occur in blocks, while a 
more graduated, single point decrease in the score occurs when you 
return to a less sporty driving style.

 

Advanced features

Advanced features accessible through the Driver Recognition software 
include:

 

* Brake support downshift (Automatic modes)

* Driver Recognition will enable early downshifting during heavy 
braking, to provide engine braking and to optimise gear selection for 
tip-in (throttle reapplication) response.

* Gear hold around corners (Automatic modes)

* This feature will enable the selected gear to be held when the vehicle 
is cornering enthusiastically, to avoid an unwanted upshift or downshift 
through the corner. Differential wheel speed and the ABS sensors on each 
wheel detect cornering.

* Gear hold going uphill / downhill (Automatic modes)

* If the throttle pedal is released when travelling up or down hills, 
upshifts are prevented to reduce shift busyness on grades (on tip-in 
when going up hill) and to assist with vehicle speed control (reduce the 
need for repeated brake application).

* Gear hold, fast-off throttle (Automatic modes)

* Upshifts are prevented when the throttle position sensor detects the 
driver has instigated a rapid lift off of the throttle pedal (fast off) 
and maintains the current gear until the driver tips-in (reapplies 
throttle pressure). It also helps prevents shift busyness in sporty 
driving and inhibits the running away feeling when cresting hills.

 

The Driver Recognition features allow for a tailored driving experience, 
where the transmission rewards different styles of driving at both ends 
of the performance spectrum.

 

A lower point count and more normalised driving style will deliver 
significant benefits in terms of refinement and fuel economy, while a 
greater point count will reward sporty driving with sharper responses 
and a more defined sporty feel. All the Driver Recognition features are 
available on all models fitted with the ZF six-speed transmission, 
although certain features are more accessible on the sports XR models 
through a more performance-biased calibration.

 

Transient rpm limit

The transient rpm limit allows the engine to momentarily exceed the 
prescribed rev limit during upshifting. This enables wide open throttle 
upshifting of gears to be scheduled at an engine speed closer to the rev 
limiter than would otherwise be possible.

 

The transient rpm feature allows the engine to exceed 6000 rpm  up to 
6250 rpm  while the transmission is completing the gear change, thereby 
taking full advantage of the high rpm performance of Barra 190 and 245T 
engines.


E-Gas!






-- 

    =Bt=
milnersXcoupe
"The Heretic"

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